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Finding the Fourth Proportional to 770.69, 1,063.55 and 421.37

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Solution

The fourth proportional to 770.69, 1,063.55 and 421.37 is: 581.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    770.69 : 1,063.55 = 421.37 : x
  2. Step 2: Convert to fraction form
    770.69/1,063.55 = 421.37/x
  3. Step 3: Cross multiply
    770.69x = 1,063.55 × 421.37
  4. Step 4: Simplify right side
    770.69x = 448,140.64
  5. Step 5: Solve for x
    x = 448,140.64/770.69
  6. Step 6: Final answer
    x = 581.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.